Z8F6421PM020SC Datasheet, PDF (34/299 Pages) Zilog, Inc. – High Performance 8-Bit Microcontrollers Z8 Encore-R 64K Series

Z8 Encore!^® 64K Series
Product Specification
14
Table 3. Signal Descriptions (Continued)
Signal
Mnemonic
I/O
MOSI
I/O
MISO
I/O
UART Controllers
TXD0 / TXD1
O
RXD0 / RXD1
I
CTS0 / CTS1
I
DE0 / DE1
O
Timers
T0OUT / T1OUT/ O
T2OUT / T3OUT
T0IN / T1IN/
I
T2IN / T3IN
Analog
ANA[11:0]
I
VREF
I
Oscillators
XIN
I
Description
Master Out Slave In. This signal is the data output from the SPI master device and
the data input to the SPI slave device. It is multiplexed with a general-purpose I/O
pin.
Master In Slave Out. This pin is the data input to the SPI master device and the data
output from the SPI slave device. It is multiplexed with a general-purpose I/O pin.
Transmit Data. These signals are the transmit outputs from the UARTs. The TXD
signals are multiplexed with general-purpose I/O pins.
Receive Data. These signals are the receiver inputs for the UARTs and IrDAs. The
RXD signals are multiplexed with general-purpose I/O pins.
Clear To Send. These signals are control inputs for the UARTs. The CTS signals are
multiplexed with general-purpose I/O pins.
Driver Enable. This signal allows automatic control of external RS-485 drivers. This
signal is approximately the inverse of the TXE (Transmit Empty) bit in the UART
Status 0 register. The DE signal may be used to ensure an external RS-485 driver is
enabled when data is transmitted by the UART.
Timer Output 0-3. These signals are output pins from the timers. The Timer Output
signals are multiplexed with general-purpose I/O pins. T3OUT is not available in 44-
pin package devices.
Timer Input 0-3. These signals are used as the capture, gating and counter inputs.
The Timer Input signals are multiplexed with general-purpose I/O pins. T3IN is not
available in 44-pin package devices.
Analog Input. These signals are inputs to the analog-to-digital converter (ADC). The
ADC analog inputs are multiplexed with general-purpose I/O pins.
Analog-to-digital converter reference voltage input. The VREF pin must be left
unconnected (or capacitively coupled to analog ground) if the internal voltage
reference is selected as the ADC reference voltage.
External Crystal Input. This is the input pin to the crystal oscillator. A crystal can be
connected between it and the XOUT pin to form the oscillator. This signal is usable
with external RC networks and an external clock driver.
PS019915-1005
Signal and Pin Descriptions